Uptime Kuma is an easy-to-use self-hosted monitoring tool.

Free open source web page change detection. Simply monitor which websites had a text change.

Monitoror is a wallboard monitoring app to monitor server status; monitor CI builds progress or even display critical values. Monitoror is a single file app written in Go.

Report URI was founded to take the pain out of monitoring security policies like CSP and HPKP. When you can easily monitor what's happening on your site in real time you react faster and more efficiently, allowing you to rectify issues without your users ever having to tell you.

WTF is a personal information dashboard for your terminal, developed for those who spend most of their day in the command line.

It allows you to monitor systems, services, and important information that you otherwise might keep browser tabs open for, the kinds of things you don’t always need visible, but do check in on every now and then.

Glances is a cross-platform curses-based system monitoring tool written in Python.

A fully featured network monitoring system that provides a wealth of features and device support.

BOSH is an open source tool for release engineering, deployment, lifecycle management, and monitoring of distributed systems.

cAdvisor (Container Advisor) provides container users an understanding of the resource usage and performance characteristics of their running containers. It is a running daemon that collects, aggregates, processes, and exports information about running containers. Specifically, for each container it keeps resource isolation parameters, historical resource usage, histograms of complete historical resource usage and network statistics. This data is exported by container and machine-wide.

cAdvisor has native support for Docker containers and should support just about any other container type out of the box.

Sensu is an infrastructure and application monitoring and telemetry solution. Sensu provides a framework for monitoring infrastructure, service & application health, and business KPIs. Sensu is specifically designed to solve monitoring challenges introduced by modern infrastructure platforms with a mix of static, dynamic, and ephemeral infrastructure at scale (i.e. public, private, and hybrid clouds).

This package checks if the application resources are running as they should and creates a service status panel.
It has the following main points:

• Highly extensible and configurable: you can create new checkers and notifiers very easily, and you can virtually change everything on it.
• Easy configuration: uses YAML as configuration files
• Resilient resource checker: if the framework is working and at least one notification channel, you should receive notification messages.
• Built-in notification system: get notifications via mail, slack, telegram or anything else you need.
• Routes for: panel, json result, string result and resource.
• Configurable panel design.
• Cache.
• Schedule checks to automatically receive notifications when a service fails.
• View app error messages right in the panel.
• Http response codes 200 and 500, on error, for services like Envoyer to keep track of your app health.

Grafana provides a powerful and elegant way to create, explore, and share dashboards and data with your team and the world.

Grafana is most commonly used for visualizing time series data for Internet infrastructure and application analytics but many use it in other domains including industrial sensors, home automation, weather, and process control.

Cron Monitoring. Get Notified When Your Cron Jobs Fail.

Make a HTTP GET request to this address from your cron job, daemon, script or long running task. When this address is not requested for a set time period, you will get alerted. Below are snippets that are ready to be copy/pasted into your own scripts.

New Relic’s SaaS-based Application Performance Monitoring helps you build, deploy, and maintain great web software.
Also, server monitoring, and more.

View raw output for critical events across servers. SeaLion gives you a graphical overview of server activity. View performance of system/custom metrics across multiple servers at a glance. The horizon charts makes it easy for you to identify patterns and find critical issues.

Monitor the accessibility of your websites with pa11y-dashboard, and protect against accessibility errors creeping into your codebase.

Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Prometheus's main features are:

• a multi-dimensional data model (time series identified by metric name and key/value pairs)
• a flexible query language to leverage this dimensionality
• no reliance on distributed storage; single server nodes are autonomous
• time series collection happens via a pull model over HTTP
• pushing time series is supported via an intermediary gateway
• targets are discovered via service discovery or static configuration
• multiple modes of graphing and dashboarding support

An open source monitoring framework.